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Utilisation et regénération des écailles de cacao pour la récupération du plomb dans les solutions acides.

Meunier, Nathalie; Haberman, Michaël; Blais, Jean-François; Tyagi, Rajeshwar Dayal (2003). Utilisation et regénération des écailles de cacao pour la récupération du plomb dans les solutions acides. Journal of Environmental Engineering and Science , vol. 2 , nº 1. p. 9-16. DOI: 10.1139/S03-003.

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Résumé

Cocoa shells, a by-product of the food industry, is a promising adsorbent for the treatment of acid metal loaded wastewaters, particularly for lead removal. Elution tests carried out using different concentrations of hydrochloric acid have shown that a good portion can be eluted using a short contact time (approximately 10 min) and a diluted acid solution (0.5-1.0 M). The use of a more concentrated acid solution causes significant mineralization of the adsorbent and does not allow to improve the elution yield. Repeated adsorption-elution cycles have shown that cocoa shells can be reused for many times. However, their lead adsorption capacity progressively decreases from 19.3 mg Pb/g during the 1st cycle to 4.8 mg Pb/g during the 10th cycle. Finally, the use of successive adsorption-elution cycles is only interesting, from an economical point of view, in the case where the acid solution is used for many elution steps.

Type de document: Article
Mots-clés libres: adsorption; elution; lead; cocoa shells; effluent; acid
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 janv. 2021 14:12
Dernière modification: 08 janv. 2021 14:12
URI: http://espace.inrs.ca/id/eprint/11065

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